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4 years ago

If you want to change the pitch of a sound, you have to change the ___

Chemistry

2 answers:

aleksandrvk [35]4 years ago

5 0

Answer: If you want to change the pitch of a sound, you have to change the frequency.

Explanation:

Pitch is the quality of the sound to judge it has higher or lower.The frequency of the sound wave is perceived as pitch.Pitch and frequency of the sound are related to each other

If want to increase the pitch we have to increase the frequency of the sound.
If want to decrease the pitch we have to decrease the frequency of the sound.

If you want to change the pitch of a sound, you have to change the frequency.

Firdavs [7]4 years ago

4 0

if you are wanting to change the pitch of a certain sound you ahve and will need to change the frequency of that sound.

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Order the follow processes from (1) the least work done by the system to (5) the most work done by one mole of an ideal gas at 2

quester [9]

Answer : The order of process from (1) the least work done by the system to (5) the most work done by the system will be:

(1) < (5) < (3) < (4) < (2)

Explanation :

The formula used for isothermally irreversible expansion is :

$w=-p_{ext}dV\\\\w=-p_{ext}(V_2-V_1)$

where,

w = work done

$p_{ext}$ = external pressure

$V_1$ = initial volume of gas

$V_2$ = final volume of gas

The expression used for work done in reversible isothermal expansion will be,

$w=-nRT\ln (\frac{V_2}{V_1})$

where,

w = work done = ?

n = number of moles of gas = 1 mole

R = gas constant = 8.314 J/mole K

T = temperature of gas = $25^oC=273+25=298K$

$V_1$ = initial volume of gas

$V_2$ = final volume of gas

First we have to determine the work done for the following process.

(1) An isothermal expansion from 1 L to 10 L at an external pressure of 2.5 atm.

$w=-p_{ext}(V_2-V_1)$

$w=-(2.5atm)\times (10-1)L$

$w=-22.5L.atm=-22.5\times 101.3J=-2279.25J$

(2) A free isothermal expansion from 1 L to 100 L.

$w=-nRT\ln (\frac{V_2}{V_1})$

$w=-1mole\times 8.314J/moleK\times 298K\times \ln (\frac{100L}{1L})$

$w=-11409.6J$

(3) A reversible isothermal expansion from 0.5 L to 4 L.

$w=-nRT\ln (\frac{V_2}{V_1})$

$w=-1mole\times 8.314J/moleK\times 298K\times \ln (\frac{4L}{0.5L})$

$w=-5151.97J$

(4) A reversible isothermal expansion from 0.5 L to 40 L.

$w=-nRT\ln (\frac{V_2}{V_1})$

$w=-1mole\times 8.314J/moleK\times 298K\times \ln (\frac{40L}{0.5L})$

$w=-10856.8J$

(5) An isothermal expansion from 1 L to 100 L at an external pressure of 0.5 atm.

$w=-p_{ext}(V_2-V_1)$

$w=-(0.5atm)\times (100-1)L$

$w=-49.5L.atm=-49.5\times 101.3J=-5014.35J$

Thus, the order of process from (1) the least work done by the system to (5) the most work done by the system will be:

(1) < (5) < (3) < (4) < (2)

8 0

3 years ago

Copper metal reacts with nitric acid according the equation below 3 Cu (s) +8 HNO 3(aq) -...m+3 Cu^ 2+ (aq)+2NO (g) +6 NO 3 (aq)

Maksim231197 [3]

Answer:

i think it is NO2 and +6 NO 6 that's all I have

5 0

3 years ago

Explain in an essay how the food chain works?

Sergio039 [100]

Answer: A food chain describes how energy and nutrients move through an ecosystem. At the basic level there are plants that produce the energy, then it moves up to higher-level organisms like herbivores. ... In the food chain, energy is transferred from one living organism through another in the form of food. In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. For example, if you had a hamburger for lunch, you might be part of a food chain that looks like this: grass rightarrow→right arrow cow rightarrow→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like this: lettuce rightarrow→right arrow human

Explanation:

6 0

3 years ago

A sample of gas contains 0.1100 mol of N2(g) and 0.3300 mol of H2(g) and occupies a volume of 20.5 L. The following reaction tak

worty [1.4K]

Answer:

20.5 L

Explanation:

-The stoichiometric reaction of the 2 gases is:

$N_2_{(g)}+3H_2_{(g)}->2NH_3_{(G)}$

-We apply the combined gas law to determine the resultant volume of the ammonia gas formed:

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\\\\\#But\\\\\frac{P_1}{T_1}=\frac{P_2}{T_2}\\\\\therefore V_1=V_2$

Since, the temperature and pressure remain constant, the volume of the ammonia gas formed is equal to the volume of the reactants.

Hence, the volume after the reaction is 20.5 L

6 0

3 years ago

Name and describe three types of chemical reactions and give an example of each

saveliy_v [14]

1. Direct Combination or Synthesis ReactionIn a synthesis reaction two or more chemical species combine to form a more complex product.
2. Chemical Decomposition or Analysis ReactionIn a decomposition reaction a compound is broken into smaller chemical species.

3. Single Displacement or Substitution ReactionA substitution or single displacement reaction is characterized by one element being displaced from a compound by another element.

4 0

4 years ago

Read 2 more answers